Optical studies of the vibrational properties of disordered solids

Barker, A. S.; Sievers, A. J.

doi:10.1103/revmodphys.47.s1.2

Cited by 743 publications

(296 citation statements)

References 430 publications

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“…In addition to the GaN E H 2 , E 1 (TO), and A 1 (LO), we identify a contribution labeled L which corresponds to the Mn LVM associated to the GaN optical branch. According to the light impurity model, [23][24][25] the frequency x TO MnÀLVM of the TO Mn-LVM can be estimated via the formula…”

mentioning

confidence: 99%

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Devillers

Leite

Silva

et al. 2013

Applied Physics Letters

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The evolution of the optical branch in the Raman spectra of (Ga,Mn)N:Mg epitaxial layers as a function of the Mn and Mg concentrations, reveals the interplay between the two dopants. We demonstrate that the various Mn-Mg-induced vibrational modes can be understood in the picture of functional Mn–Mgk complexes formed when substitutional Mn cations are bound to k substitutional Mg through nitrogen atoms, the number of ligands k being driven by the ratio between the Mg and the Mn concentrations.

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mentioning

confidence: 99%

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Devillers

Leite

Silva

et al. 2013

Applied Physics Letters

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“…A 1g modes fit with two well defined phonon modes below the T B and these modes appear low intensity and considerable thermal band broadening above T B . The observation of two phonon modes below T B matched with the complex B-site relaxor family [43][44][45][46] unlike to classical relaxors (PbMg Further softening of F 2g mode till 350 K may be due to lattice contraction as can be seen in Fig. 5 (c).…”

Section: C2 Phonon Dynamics At the Regime Of Negative Thermal Expanmentioning

confidence: 88%

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
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We present Raman data on both single-crystal and thin-film samples of the multiferroic PbFe 0.5 Nb 0.5 O 3 . we show first that the number and selection rules of Raman lines is compatible with a face-centered cubic Fm-3m structure, as is known in other ABO 3 relaxors, such as The increase in frequency with increasing temperature for the lowest-energy F 2g phonon mode is particularly unexpected. These changes suggest the transition of crystal structure from an ordered phase to a disordered one near T B . The Raman study revealed phonon anomalies in the vicinity of T m and T N that are attributed to the dynamical behavior of polar nano-regions (PNRs) and spin-phonon coupling due to its relaxor and multiferroic nature respectively, which is well supported by dielectric and magnetic properties of the PFN thin film. Softening of the Fe-O mode was observed near the T N . We correlate the anomalous shift of the Fe-O mode frequency with the normalized square of the magnetization sublattice; agreement with the experimental 2 results suggest strong spin-phonon coupling near T N due to phonon modulation of the superexchange integral, however the shifts in frequency with temperature are small (< 3 cm -1 ).

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“…The description of a solid with the popular ball and spring model was first used in 1686 by Newton [38]. In a recent review by Barker and Sievers [39], a chain of balls and springs, closed in itself in order to circumvent the boundary problem, has been used to arrive at the vibrational spectrum of a solid. The four types of vibrational frequencies which are found in crystalline solids are:…”

Section: Local Vibrational Modesmentioning

confidence: 99%

Far infrared fourier transform spectroscopy of semiconductors

Häller

1987

Mikrochim Acta

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Optical studies of the vibrational properties of disordered solids

Cited by 743 publications

References 430 publications

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
View full text Add to dashboard Cite

Far infrared fourier transform spectroscopy of semiconductors

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Optical studies of the vibrational properties of disordered solids

Cited by 743 publications

References 430 publications

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5OCorrea1, Kumar2, Priya3 et al. 2011Phys. Rev. B570300View full textAdd to dashboardCite

Far infrared fourier transform spectroscopy of semiconductors

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Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
View full text Add to dashboard Cite